Implant and anchor assembly

Patent metadata

Field	Value
Publication number	US-9931219-B2
Application number	US-201514640529-A
Country	US
Kind code	B2
Filing date	Mar 6, 2015
Priority date	Mar 7, 2014
Publication date	Apr 3, 2018
Grant date	Apr 3, 2018

Abstract

An implant assembly comprising an implant having a load bearing surface with a contour corresponding to a patient's articular surface, and a bone facing surface including a fixation element, an anchor configured to be secured to bone beneath said patient's articular surface, said anchor including a second fixation element, and wherein said first fixation element is configured to be secured to said second fixation element.

First claim

What is claimed is:

1. An implant assembly comprising:
an implant including:
an implant body having a load bearing surface with a contour corresponding to a patient's articular surface, a bone facing surface, a fixation ring extending outward generally below said bone facing surface, and at least one recess extending at least partially around an outer perimeter of the fixation ring, wherein said load bearing surface comprises a plastic composition or a metal composition; and
an implant fixation member comprising at least one fastener segment configured to snap into said at least one recess to couple said implant fixation member to said implant body, said implant fixation member further including a first fixation element comprising either a plastic composition or a metal composition;

an anchor configured to be secured to bone beneath said patient's articular surface, said anchor including a second fixation element; and
wherein said first fixation element is configured to be secured to said second fixation element; and
wherein when said first fixation element comprises said plastic composition, said second fixation element comprises a plastic composition and said load bearing surface comprise a metal composition; or
wherein when said first fixation element comprises said metal composition, said second fixation element comprises a metal composition and said load bearing surface comprise a plastic composition.

2. The implant assembly of claim 1 , wherein:
said load bearing surface of implant comprises said plastic composition; and
said first fixation element comprises said metal composition and said second fixation element comprises said metal composition.

3. The implant assembly of claim 1 , wherein:
said load bearing surface of said implant comprises said metal composition; and
said first fixation element comprises said plastic composition and said second fixation element comprises said plastic composition.

4. The implant assembly of claim 1 , wherein:
said first fixation element and said second fixation element are configured to mechanically connect with each other to form a mechanical connection therebetween.

5. The implant assembly of claim 4 , wherein:
said first fixation element and said second fixation element are further configured to frictionally engage with each other to form a frictional connection therebetween.

6. The implant assembly of claim 5 , wherein:
said first fixation element includes a tapered portion and said second fixation element includes a tapered portion; and
said tapered portions are configured to frictionally engage with each other to form said friction connection therebetween.

7. The implant assembly of claim 5 , wherein:
said first fixation element comprises a tapered recess; and
said second fixation element comprises a tapered protrusion.

8. The implant assembly of claim 5 , wherein:
said first fixation element comprises a tapered protrusion; and
said second fixation element comprises a tapered recess.

9. The implant assembly of claim 5 , wherein:
one of said first fixation element or said second fixation element comprises a protrusion having a protrusion sidewall; and
said protrusion sidewall includes at least one protrusion sidewall fixation feature.

10. The implant assembly of claim 9 , wherein:
said at least one protrusion sidewall fixation feature comprises at least one barb.

11. The implant assembly of claim 10 , wherein:
said at least one barb comprises at least one barb ring which extends around a circumference of said protrusion.

12. The implant assembly of claim 11 , wherein:
said at least one barb ring extends continuously around said circumference of said protrusion.

13. The implant assembly of claim 11 , wherein:
said at least one barb ring comprises a plurality of barb ring segments which extend around said circumference of said protrusion.

14. The implant assembly of claim 11 , wherein:
said at least one barb comprises at least two barb rings which extends around a circumference of said protrusion.

15. The implant assembly of claim 14 , wherein:
each of said at least two barb rings comprises a plurality of barb ring segments which extend around said circumference of said protrusion; and
said plurality of barb ring segments of each of said at least two barb rings are laterally offset relative to one another around said circumference of said protrusion.

16. The implant assembly of claim 9 , wherein:
said at least one protrusion sidewall fixation feature comprises at least one rib.

17. The implant assembly of claim 16 , wherein:
said at least one rib comprises a plurality of ribs.

18. The implant assembly of claim 17 , wherein:
said plurality of ribs extend substantially longitudinally along a longitudinal length of said protrusion.

19. The implant assembly of claim 17 , wherein:
said plurality of ribs are substantially equally spaced around a circumference of said protrusion.

20. The implant assembly of claim 17 , wherein:
said plurality of ribs are substantially parallel to each other.

21. The implant assembly of claim 4 , wherein:
said first fixation element and said second fixation element are further configured to mechanically interlock with each other to form a positive mechanical engagement therebetween.

22. The implant assembly of claim 21 , wherein:
said first fixation element comprises a tapered recess and wherein said second fixation element comprises a tapered protrusion.

23. The implant assembly of claim 21 , wherein:
said first fixation element comprises a tapered protrusion and wherein said second fixation element comprises a tapered recess.

24. The implant assembly of claim 21 , wherein:
one of said first fixation element or said second fixation element comprises a protrusion having a protrusion sidewall; and
said protrusion sidewall includes at least one protrusion sidewall fixation feature; and
said other of said first fixation element or said second fixation element comprises a recess having a recess sidewall; and
said recess sidewall includes at least one recess sidewall retention feature.

25. The implant assembly of claim 24 , wherein:
said at least one protrusion sidewall fixation feature is configured to mate with said at least one recess sidewall fixation feature to form said mechanical interlock.

26. The implant assembly of claim 24 , wherein:
said at least one protrusion sidewall fixation feature comprises at least one barb;
said at least one recess sidewall fixation feature comprises at least one ridge; and
said at least one barb is configured to cooperate with said at least one ridge to form said mechanical interlock.

27. The implant assembly of claim 24 , wherein:
said at least one protrusion sidewall fixation feature comprises at least one projection; and
said at least one recess sidewall fixation feature comprises at least one indentation; and
said at least one projection is configured to mate with said at least one indentation to form said mechanical interlock.

28. The implant assembly of claim 1 , wherein:
at least a portion of said anchor includes a threaded portion configured to engage said bone.

29. The implant assembly of claim 1 , wherein:
said implant is a synovial joint implant.

30. The implant assembly of claim 1 , wherein:
said i

Assignees

• Arthrosurface Inc

Inventors

• Sikora George
• Ek Steven W

Classifications

• A61F2/40 Primary

  for shoulders · CPC title

• A61F2/4081

  Glenoid components, e.g. cups · CPC title

• A61F2/4606

  of wrists or ankles; of hands, e.g. fingers; of feet, e.g. toes · CPC title

• A61F2002/30364

  Rotation about the common longitudinal axis · CPC title

• A61F2/30756 Primary

  Cartilage endoprostheses (A61F2/3603 takes precedence) · CPC title